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## Homework Statement

## Homework Equations

## The Attempt at a Solution

I've gone round in circles doing this! I started of by writing it as an integral of (psi* x A_hat

^{2}x psi) w.r.t dx, then using the equation above but I keep coming back at my original equation after flipping it around. Are there any tricks in particular that I should know when dealing with squares of operators? Or any assumptions that I need to make? Please help :(